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Financial Instruments and Risk Management - Foreign Currency Risk, Interest Rate Risk, Interest Rate Swaps and Commodity Price Risk (Details)
$ in Thousands
Dec. 31, 2021
CAD ($)
usdPerBbl
Dec. 31, 2021
USD ($)
usdPerBbl
Dec. 31, 2020
USD ($)
Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Increase/decrease risk in foreign exchange rate $ 0.01    
Effect on net income 2,300,000    
Currency risk | U.S. dollar denominated, liabilities      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
U.S. dollar denominated   $ 829,934 $ 934,731
Currency risk | U.S. dollar denominated, assets      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
U.S. dollar denominated   $ 602,503 $ 759,508
Interest rate risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on net income $ 5,100,000    
Impact of base point change on interest rates 100.00% 100.00%  
Commodity price risk | Oil Price      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Potential impact of crude oil price changes | usdPerBbl 1.00 1.00  
Potential impact of natural gas price changes $ 10,400,000    
Commodity price risk | Natural Gas Price      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Potential impact of crude oil price changes | usdPerBbl 0.25 0.25  
Potential impact of natural gas price changes $ 3,700,000